The number of handguns confiscated at the nation’s airport security checkpoints was up 21% through May 1 compared to a year ago — and 45% compared to 2012, a National Security Zone analysis of Transportation Security Administration data it maintains shows.

Also trending up in the first part of the year: The percentage of guns that were loaded and that had a bullet in the chamber when they were discovered in carry-ons or on the passenger. Some 85% of guns were loaded compared to 82% a year ago, and 30% had a bullet in the chamber, up from 25% in the first part of 2013.

For full story, see Medill National Security Zone.

Top airports, Jan. 1 to May 1 2014 vs. 2013

SOURCE: National Security Zone analysis of data compiled from the TSA.